package org.dut.book.Configure;

import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.SneakyThrows;
import org.dut.book.model.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;



@ControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice {
    @Autowired
    private ObjectMapper objectMapper;

    // 选择哪些类、哪些方法的response要进行处理
    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return ! returnType.getParameterType().isAssignableFrom(Result.class);
    }

    @SneakyThrows
    @Override
    public Object beforeBodyWrite(Object body,
                                  MethodParameter returnType,
                                  MediaType selectedContentType,
                                  Class selectedConverterType,
                                  ServerHttpRequest request,
                                  ServerHttpResponse response) {
        if(body instanceof String){
            return objectMapper.writeValueAsString(Result.success(body));
        }
        return Result.success(body);
    }
}
